Sound velocities in shock-compressed soda lime glass: Melting and liquid-state response
Sound velocities in shock-compressed soda lime glass: Melting and liquid-state response
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冲击压缩钠钙玻璃中的声速：熔化和液态响应
DOI：
10.1103/physrevb.104.014113
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发表时间：
2021
影响因子：
3.7
通讯作者：
Y. Gupta
中科院分区：
文献类型：
--
作者：
P. Renganathan;T. Duffy;Y. Gupta
在峰值冲击应力范围为40~90 GPa时，测定了钠钙玻璃(SLG)中的纵向声速(和弹性模数)。用激光干涉法测量了SLG样品在LiF光学窗口上的碰撞速度历史和声速。在所有的实验中，SLG的响应由一个急剧跳跃到一个恒定状态，然后是一个释放波组成。测量的纵向声速和声模在52~58 Gpa之间有明显的下降，这为冲击压缩SLG中无定形固体向液体的转变提供了实验证据。SLG的熔融应力阈值(55 Gpa)远低于冲击压缩熔融二氧化硅的应力阈值(72 Gpa)，说明了网络修饰阳离子对熔融开始的影响。声速、激波速度和Hugoniot斜率的相对值-介于58和90 Gpa之间-与冲击压缩液体的热力学响应完全一致。利用实验结果，确定了液体SLG在90 GPa时的Gr“uneisen参数(Gr”uneisen参数)值，并用其建立了液体SLG的Mie-Gr“uneisen状态方程。
Longitudinal sound velocities (and elastic moduli) were determined in soda lime glass (SLG) at peak shock stresses ranging between 40 and 90 GPa. Laser interferometry was used to obtain particle velocity histories and sound velocities by impacting SLG samples on lithium fluoride (LiF) optical windows. In all experiments, the SLG response consists of a sharp jump to a constant state followed by a release wave. The measured longitudinal sound velocities and moduli showed a marked decrease between 52 and 58 GPa, providing experimental evidence for the transformation from an amorphous solid to a liquid in shock-compressed SLG. The stress threshold (\ensuremath{\sim}55 GPa) for melting in SLG is considerably lower than the threshold reported in shock-compressed fused silica (\ensuremath{\sim}72 GPa), showing the effect of network-modifying cations on the onset of melting. The relative values of sound velocities, shock velocities, and the Hugoniot slopes---between 58 and 90 GPa---are fully consistent with the thermodynamic response of a shock-compressed liquid. Using the experimental results, the Gr\"uneisen parameter (\ensuremath{\Gamma}) values were determined for liquid SLG to 90 GPa and then used to provide the Mie-Gr\"uneisen equation of state for liquid SLG.